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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m hr °C
kcal/m² hr °C
kcal/hr °C
kcal/m²

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Heat and Mass Transfer
Thermal diffusivity of a substance is

Inversely proportional to density of substance
Inversely proportional to specific heat
Directly proportional to the thermal conductivity
All of these

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Heat and Mass Transfer
A grey body is one whose absorptivity

Does not vary with temperature and. wavelength of the incident ray
Varies with temperature
Varies with wavelength of the incident ray
Is equal to its emissivity

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Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Grashoff number
Biot number
Peclet number
Stanton number

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Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Conduction and radiation combined
Convection
Conduction
Radiation

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

More or less same as for liquids and gases
Less than those for gases
More than those for liquids and gases
Less than those for liquids

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MORE MCQ ON Heat and Mass Transfer

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